Three judges in London rejected a bid by Krezolek to appeal against his murder convictions in 2014, describing it as "unarguable".

They also threw out challenges by Krezolek and Luczak against their "excessive" sentences for the "unimaginable" killing.

Lady Justice Hallett, announcing the decision of the court, described the story of Daniel's suffering and death as "heartbreaking".

During the couple's trial it emerged he was ignored by various agencies because of stressed staff and a lack of basic equipment and accurate records.

Teachers and doctors missed signs that Daniel - who weighed just 1st 9lbs when he died - was being starved and abused at home.

(Image: West Midlands Police)

During his final months, he was denied food, forced to perform punishment exercises, poisoned with salt and subjected to water torture.

His mother and Krezolek, both originally from Poland, were convicted of murder and sentenced to at least 30 years in jail in August 2013.

Late last year, more than 200,000 backed calls for Daniel Pelka’s law to be introduced which would support people who work with children to report suspected or known abuse of a child to a local authority for assessment.

A full inquest into Luczak's death is expected to take place in Derbyshire at some point next year.